Douglas,
Where did you find the priming-lever pump? My '60 220S has the same problem. Unfortunately the P O replaced the original pump with a non-primer. In winter, I can go over a week without excessive cranking, but it's really a problem in the summer. I now keep a 1 pint squirt bottle handy, to prime the Solexes and save my starter.

A solution I used on my '57 DKW coupe, for which no priming-lever pump was availible, was to fit an electric 'ticker' type pump.
I now turn on the ignition and first, listen for the ticking to slow to a stop as the carb is filled, then it's ready to crank.

Happy Motoring, Mark

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DrDKW